<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <h3>利用jsonp解决跨域问题</h3>
    <button id="btn">按钮</button>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js"></script>
    <script>
      /* function fn(data) {
          console.log(data);
      }
      btn.onclick = function() {
          const script = document.createElement('script')
          script.src = 'http://localhost:3000/jsonpTest?callback=fn'
          document.body.appendChild(script)
      } */
      $('#btn').on('click',function() {
          $.ajax({
              url:'http://localhost:3000/jqueryJsonp',
              dataType:'jsonp',
              success:function(data) {
                  console.log(data);
              }
          })
      })
    </script>
  </body>
</html>
